98 528i Overheating!! What Else Could It Be - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 05-22-2005, 09:31 PM
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i have changed the fluid , water pump, thermostat, and fan clutch . the fan is turning strong. what else could it be. my 98 528i overheats usually when i am in a drive thru or sitting in traffic. please help, this is really irritating! i am almost tempted to sell this thing.
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#2 (permalink) Old 05-22-2005, 09:50 PM
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Quote:
Originally posted by blke39@May 22 2005, 09:31 PM
i have changed the fluid , water pump, and thermastat. what else could it be. my 98 528i overheats usually when i am in a drive thru or sitting in traffic. please help, this is really irritating! i am almost tempted to sell this thing.
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What else it could be? Many things! but for now check your fan/fan clutch (the belt driven one)...also it pays to make sure the electrical fan is working (testing: turn the AC on, you should hear).......then let us know....good luck
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#3 (permalink) Old 05-22-2005, 09:52 PM
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both fans are turning on and are turning stong. any other sugg.?
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#4 (permalink) Old 05-22-2005, 09:55 PM
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Quote:
Originally posted by blke39@May 22 2005, 09:52 PM
both fans are turning on and are turning stong. any other sugg.?
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Any white smoke from the muffler?
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#5 (permalink) Old 05-22-2005, 09:56 PM
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no white smoke
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#6 (permalink) Old 05-22-2005, 09:57 PM
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new belts also
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#7 (permalink) Old 05-22-2005, 10:04 PM
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OOOK..... going back to basics:
1. Insufficient coolant can cause overheat....double check it..yes again.
2. When you changed the pump/thermo etc..I assume you refilled it with coolant; but did you bleed the system PROPERLY? that is getting the AIR/BUBBLES out of the system using the plastic screw/s?
3. Simply a turning fan does not mean proper cooling....fans with bad clutches do turn too!!!
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#8 (permalink) Old 05-22-2005, 10:15 PM
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what is the sufficient coolant and/or mix. i bled the air out of the the two plastic screws. check. the fan clutch was replaced 5000 miles ago. check. i will drain the fluid in the mornng. what fluid should i use and what mix. i used water wetter. i probably did not use the right mix though. i used 40% water 40% antifreeze and 20% water wetter.
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#9 (permalink) Old 05-22-2005, 10:21 PM
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Quote:
Originally posted by blke39@May 22 2005, 10:15 PM
what is the sufficient coolant and/or mix. i bled the air out of the the two plastic screws. check. the fan clutch was replaced 5000 miles ago. check. i will drain the fluid in the mornng. what fluid should i use and what mix. i used water wetter. i probably did not use the right mix though. i used 40% water 40% antifreeze and 20% water wetter.
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Insufficient= not enough coolant
At this point I don't think the right mixture is relevent; remeber the car overheats when IDLING ONLY= not drawing enough air to cool the engine down.....my bet is on the fan before I go near the head/head gasket which are next on the list..I hope not...
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#10 (permalink) Old 05-22-2005, 11:17 PM
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I had the same problem that you had with my 1997 528i. I bought it last July with 111,850 miles and little maintenance history, on eBay no less, although I had a mechanic check it out beforehand. For the most part it has been lovely, but for the first several months that I owned it, it would overheat whenever I idled or sat in traffic for >30 minutes. Given that I now live in Washington DC, that was a problem; I dunno if you've ever been on the beltway here, but it doesn't move very fast during rush hour! I replaced the thermostat, water pump, and electric fan before my new mechanic in Merrifield VA figured out what the problem was.

The coolant expansion tank in BMW's--and in many other German cars--communicates with the radiator through fairly small passages. These are perfect places for goo to collect over time. In addition to that, someone previous to me had put preventative radiator sealant fluid in with the coolant. That fluid is intended to plug small holes that appear in the radiator over time, and works just fine in American cars that have big passages in their radiators. It doesn't work so well in German cars because of those small holes, and combined with the other goo that accumulated in those coolant expansion tank holes, it severely restricted the coolant flow through the radiator. This isn't a problem at speed because the wind naturally provides enough cooling capacity, but when the car slows down, reduced coolant flow can diminish the abilities of your radiator quite severely.

The fix was to replace the coolant expansion tank. My guy replaced it with what I'm pretty sure is a 540i tank. In replacing it, he was able to remove the gunked-up holes in the old one, and now the coolant flows exactly like it's supposed to. This was about 3,500 miles ago, and I haven't had a cooling problem since then. The part was about $65, and the whole job cost about $140 including labour, new coolant, etc.

You should probably have the head gasket pressure-tested just to make sure there aren't any leaks; you don't want that thing blowing on you when you're screaming down the highway. My bet, though, is that the coolant expansion tank replacement might help you quite a bit--and it's definitely one of the cheapest possible repairs you can try!!!

In addition to that, you might go to a site like bavauto.com and get radiator coolant temperature sensors that will turn your electrical fan on at lower temperatures. This is just generally good for your engine, keeping it cooler all the time--it has the effect of making your cooling system more efficient. Generally more air=cooler engine=happier engine.

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#11 (permalink) Old 05-23-2005, 07:45 AM
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[Two potentially bad things happen at idle, yes the cool air coming in is gone, but the coolent flow is also very low, and a gumed up system will provide enough resistance to keep the coolent flowing. My 97 528i does the same thing, havent had time to dig into it but I believe its gummed up lines. Your other option, instead of replacking things is bringing it to a mechanic and they will pressurize your system and blast it out. My local BMW shop will do it fo an hours labor $60.00 ... now thats cheap in my opinion.

Good luck

At this point I don't think the right mixture is relevent; remeber the car overheats when IDLING ONLY= not drawing enough air to cool the engine down.....my bet is on the fan before I go near the head/head gasket which are next on the list..I hope not...
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#12 (permalink) Old 05-23-2005, 04:17 PM
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I am no expert but I do know that there are many other things, even unrelated to the coolant system that can cause this problem.

If the ignition timing is slightly out it can be causing this problem that is not normaly apparent due to the cooling air.

My 89 E34 520i runs just below half way temperature all the time unless I am in traffic for about 10 mins, then it starts to warm up. I always just turn the heater up and open the windows.
Apparently no E34's have ever liked sitting in traffic, its one of the few complaints I found about the car when looking into buying one.

The spark plugs should give a bit of a hint as to wether the fuel mixture and or ignition timing is right. If the fuel mixtue is off, thanks to a non standard exhaust systemor faulty sensor this could also cause the problem.
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#13 (permalink) Old 05-23-2005, 09:55 PM
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i really appreciate all of these CHEAP suggestions, ifeel a lot better now. thanks again for all of the help
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#14 (permalink) Old 05-24-2005, 11:09 AM
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they have test kits available which you test your coolant for the chemical compounds frequently found in headgaskets. if it tests positive you know your headgasket is falling apart.

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#15 (permalink) Old 05-26-2005, 12:29 PM
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try puttin dry ice packs all over in the engine bay before you drive everyday should cool things down a bit


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